You're very funny, sir. Jesus had a great sense of humor, too. But do you know what he also had? Love and compassion for your sins. He died so you could live!
So if Charles Manson or Hitler believed in Jesus, they'd be in heaven when they died?
Absolutely! God forgives all our sins, no matter how big or small.
So I could chop you up with an ax, grind your bones into paste, and serve your remains at the local TGI Fridays... and I can still get into heaven if I believed in Jesus the whole time?